Stair tread cover



FIG. 1 is a top perspective view of a stair tread cover showing my new design;

FIG. 2 is a front elevation view of the stair tread cover of FIG. 1;

FIG. 3 is a side elevation view of the stair tread cover of FIG. 1;

FIG. 4 is a top plan view of the stair tread cover of FIG. 1;

FIG. 5 is a bottom plan view of the stair tread cover of FIG. 1; and,

FIG. 6 is another top perspective view of the stair tread cover of FIG. 1.

The broken lines are included for the purpose of illustrating non-claimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a stair tread cover, as shown and described. 